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Related Experiment Videos

Peripheral dose measurement with a MOSFET detector.

Martin J Butson1, Tsang Cheung, Peter K N Yu

  • 1Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong. butsonm@iahs.nsw.gov.au

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|February 11, 2005
PubMed
Summary

This study validates Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) dosimetry systems for measuring peripheral therapeutic radiation doses. MOSFETs accurately assess these doses, aiding in vivo radiotherapy assessments.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Accurate measurement of peripheral doses is crucial in radiotherapy.
  • Existing dosimetry methods may have limitations in assessing these low-dose regions.
  • Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) offer potential for in vivo dosimetry.

Purpose of the Study:

  • To evaluate the accuracy of a MOSFET dosimetry system for peripheral therapeutic doses from high-energy X-rays.
  • To compare MOSFET measurements with ionization chamber data in peripheral beam regions.
  • To determine the suitability of MOSFETs for in vivo dose assessments in radiotherapy.

Main Methods:

  • Evaluated a MOSFET dosimetry system's accuracy for peripheral doses.
  • Compared MOSFET measurements with ionization chamber measurements.

Related Experiment Videos

  • Utilized 6 MV and 18 MV X-ray beams.
  • Assessed measurements in high-sensitivity mode up to 15 cm from the beam edge.

    • Main Results:

    • The MOSFET system demonstrated high reproducibility in dose measurement, with relative standard deviations within 1% of the maximal dose.
    • Accurate measurements were achieved up to 15 cm from the beam edge for both 6 MV and 18 MV X-ray beams.
    • The MOSFET system effectively measured peripheral doses.

    Conclusions:

    • MOSFET dosimetry systems are accurate for evaluating peripheral therapeutic doses from high-energy X-rays.
    • The MOSFET system's performance is comparable to ionization chambers in peripheral regions.
    • MOSFET devices are beneficial for in vivo dose assessments in radiotherapy, enhancing patient safety and treatment efficacy.